package org.yanghe;


import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;

@SpringBootApplication
@EnableEurekaClient
@EnableCircuitBreaker   //@EnableHystrix继承了@EnableCricuitBreaker
public class ProviderApp8001 {
    public static void main(String[] args) {
        SpringApplication.run(ProviderApp8001.class);
    }

    /**
     * 此配置是为了服务监控而配置，与服务容错本身无关，spring cloud 升级后的坑
     * ServletRegistrationBean 因为spring boot 默认路劲不是 ”/hystrix.stream“
     * 只要在自己的项目里面配置上下面的servlet 就可以了。
     * @return
     */
    @Bean
    public ServletRegistrationBean getServlet(){
        HystrixMetricsStreamServlet streamServlet = new HystrixMetricsStreamServlet();
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(streamServlet);
        registrationBean.setLoadOnStartup(1);
        registrationBean.addUrlMappings("/hystrix.stream");
        registrationBean.setName("HystrixMetricsStreamServlet");
        return registrationBean;
    }
}

/*

@EnableDiscoveryClient和@EnableEurekaClient

共同点：都是能够让注册中心能够发现，扫描到该服务。

不同点：@EnableEurekaClient只适用于Eureka作为注册中心，@EnableDiscoveryClient 可以是其他注册中心。

 */